<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>

    .triangle {
        position: relative;
        left: 50%;
        width: 0;
        height: 0;
        border-right: 50px solid skyblue;
        border-top: 50px solid transparent;
        border-bottom: 50px solid transparent;
        transform: rotate(-226deg);
    }


</style>
<body>
<div class="triangle"></div>
</body>
</html>